public class ReplacementTester{
   public static void main(String[] args){
      String greeting="Hello, elite hacker!";
      // your work here 
      // call the replace method four times
      greeting=greeting.replace('e','3');
      greeting=greeting.replace('l','7');
      greeting=greeting.replace('o','0');
      greeting=greeting.replace('i','1');
      System.out.println(greeting);
      System.out.println("Expected: H3770, 371t3 hack3r!");
   }
}